cogs in back, single gear up front???
#1
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cogs in back, single gear up front???
I'm not sure if anyone does this.... but, I've got a frame and fork i'm building up as my commuter/single track bike... and i was thinking that since i don't use the small ring and hardly use the big ring(got the road bike for fast stuff).. might be easier for me to make this a 9 speed bike. besides cranks with one chainring... is there anything else that I would need to purchase? assuming this is a good idea(which seems to be, for me)
thanks for any help given...
thanks for any help given...
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#2
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depending on how you set it up (chainline of front ring relative to rear cassette), you might not be able to reliably use some of the gears with a 9 speed. i'm not particularly well-versed with respect to chainline tolerances on geared setups, but i know that you can only have it so far off. i suspect that, with a nine speed, if you can get the single chainring straight on with the fifth gear, you will probably be okay. just something to take into account.
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You relaise that this is the singlespeed and fixed gear (ie bikes with one gear) forum, don't you? You may have better luck in the commuting forum.
#5
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Originally Posted by Momentum
You relaise that this is the singlespeed and fixed gear (ie bikes with one gear) forum, don't you? You may have better luck in the commuting forum.
yes, I understand what forum this is... I was just asking.
thanks for the input all... I'll take it over to the commuting forum.
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It should work. Your chainline might run into trouble if you were thinking of using the largest or smallest ring, but in your case it should work fine.
#7
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Back in my day we used to call that a 5-speed. I think you'd be better off using in internally geared hub like a Shimano Nexus INter-8 or SRAM S7
#8
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Originally Posted by Momentum
You relaise that this is the singlespeed and fixed gear (ie bikes with one gear) forum, don't you? You may have better luck in the commuting forum.
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sheldon brown has a similar setup, i forgot which bike he uses it on. one problem you might run into is that the chain might fall off the front. you should use a single speed chainring with high teeth so that it wont shift off. you could also use chain stoppers which prevent the chain from falling over.
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or a front derailleur (no lever necessary) to act as chain guide.
#12
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thanks for the suggestions guys... I've already done a search and found some issues to look for: like the 3rd eye chain thing, fr derailler fixed in one position. I was just wondering about chainline and spacing issues with a 9sp cassette... and anything else i was not aware of.
My next question was going to be how to set up as a single speed with the hub I already have instead of buying a fixed gear or s/s hub. but... I think i'll think about it alittle more.
thanks again everyone....
My next question was going to be how to set up as a single speed with the hub I already have instead of buying a fixed gear or s/s hub. but... I think i'll think about it alittle more.
thanks again everyone....
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isn't this a common set-up for trials riders? keep in mind i said TRIALS not time trials..i could see everything getting out of control if i didn't make that clear.
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Wasn't trying to be rude - just checking that you knew.
If you're commuting with it (ie not doing trials) then you may find that a non-ramped, high tooth singlespeed/track ring on the front keeps the chain in place without needing a derailleur or other funky devices.
If you're commuting with it (ie not doing trials) then you may find that a non-ramped, high tooth singlespeed/track ring on the front keeps the chain in place without needing a derailleur or other funky devices.
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Moved to cyclocross, since OP began a thread in commuting.
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#17
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Originally Posted by Wheels4
i was thinking that since i don't use the small ring and hardly use the big ring(got the road bike for fast stuff).. might be easier for me to make this a 9 speed bike. besides cranks with one chainring... is there anything else that I would need to purchase?
I did this with a mtb bike a few years back - worked fine.
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hey wheels, I am going to do the same thing. I bought a cheapo mtb bike at a garage sale for 15.00. I am going to convert it to a single speed beater. there are several places that have a tension device and spacers for the back. I am going to just take off the fd and put on a jumpstop to stop the chain coming off, then I am going to put this kit on from nashbar and try it out. i'll see hopw it works and go from there. here's a link to nashbar kit, 29.00 is cheap enough....also surly has some options too but more money...
https://www.nashbar.com/profile.cfm?c...eid=&pagename=
https://www.nashbar.com/profile.cfm?c...eid=&pagename=
#20
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Originally Posted by doco
oh if you decide on the nashbar set, get the 10% off coupon and use that too...whole thing will set you back 26.00
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#21
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Originally Posted by vobopl
or a front derailleur (no lever necessary) to act as chain guide.
#22
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There's a few threads on this in the mtb forum. 1 current and many to find using the search function.
Mtb cranks you just run the ring on the middle mount of the triple, chainline should be straight to the 5th cog. A single on a double would have an incorrect chainline -use a track or bmx single crank\spyder I guess?
Mines 38 to 11-30 not dedicated offroad, I do trials type climbing.
Max around 21.8? mph @ 80rpm flatland (26 inch wheel.) do it on 7-8 clusters (I need a strong chain for climbing).
Less IS more...fun.
And lighter.
G-luck
Mtb cranks you just run the ring on the middle mount of the triple, chainline should be straight to the 5th cog. A single on a double would have an incorrect chainline -use a track or bmx single crank\spyder I guess?
Mines 38 to 11-30 not dedicated offroad, I do trials type climbing.
Max around 21.8? mph @ 80rpm flatland (26 inch wheel.) do it on 7-8 clusters (I need a strong chain for climbing).
Less IS more...fun.
And lighter.
G-luck
Last edited by jeff williams; 01-12-06 at 08:59 PM.
#23
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xlntrider.... how is that ratio working for ya? you climb alot with it? I have some pretty hard climbs on my commute.... and I was thinking about going with a 40 or something close. My cassette is 11-34 so that helps alittle bit.
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Honestly, the MTB cassette is overkill for road riding, I problably use only the 6 smallest cogs on the road, even on steep hills. Of couse I'm more of a "masher" than a "spinner"
For CX the combination is usually pretty good. I say usually, because last Sunday, the mud was so thick that I could hardly turn the cranks on the flats and even had to pedal to carry any speed on the downhill sections. I was really wishing I had brought my MTB to the race that day.
For CX the combination is usually pretty good. I say usually, because last Sunday, the mud was so thick that I could hardly turn the cranks on the flats and even had to pedal to carry any speed on the downhill sections. I was really wishing I had brought my MTB to the race that day.
#25
I couldn't car less.
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I'm 38 to 11-30. Runs great on anything. 26 inch wheels.